Attachment fob milling



May 21, 1929. F. SCHERR, JR 1,713,981

ATTACHMENT FOR MILLING SCRAPER PLATES AND THE LIKE Filed May 15, 1925 4 Sheets-Sheet l I I 9 4- 7 gwuemtoz 1 May 21, 1929. c JR I 1,713,981

ATTACHMENT FOR MILLING SGRAPER PLATES AND THE LIKE Filed ma 15. 1925 4 Sheets-Sheet 2 I 61mm,

y 1929- F. SCHERR. JR 1,713,981

ATTACHMENT FOR MILLING SCRAPER PLATES AND THE LIKE Filed May 15, 1925 4 Sheets-Sheet 5 sz 35 k az 25 .2 L9 1 53 May 21, 1.929 SCHE RR, JR 1,713,931

ATTACHMENT FOR MILLING SQRAPERPLATES AND THE LIKE v Filed May 15, 1925 4 Sheets-Sheet 4 Patented May 21, 1929.

UNITED STATES PATENT OFFICE.

FREDERICK SCHERR, JR, OF FAJARDO, PORTO RICO, .ASSIGNOR, BY MESNE ASSIGN- MENTS, TO FARREL-BIRMINGHAM COMPANY INCORPORATED, OF ANSONIA, CON- NECTICUT, A CORPORATION OF CONNECTICUT.

ATTACHMENT FOR MILLING SCRAPER PLATES AND THE LIKE.

Application filed May 15, 1925.

This invention relates to an attachment which is adapted to be applied to a standard style of planer or shaper, generally found .in tool rooms or other machinery repairing departments, whereby the planer or shaper is readily converted into a milling machine and may be efficiently used to mill teeth in or repair and reshape the teeth, of what are known as sugar mill knives or scraper bars.

A sugar cane mill generally comprises a set of crushing rolls, called crushers, and a plurality of sets of mice extracting rolls, called mills. The rolls of the crusher-s and the rolls of the mills are usually provided with peripheral grooves or teeth of V shape in cross section. These grooves are, of course, in direct contact with the cane and must be continually cleaned in order not to become clogged with the same. Scraper knives or bars are used for this purpose. These scraper bars are provided with teeth along one edge which c0rrespond exactly in pitch and form to the peripheral grooves on the rolls and extend across the entire face of the rolls. The bars are usually fairly long, e. g., about six feet, but quite narrow. As a result of the continuous action of the sugar cane against the edges of the teeth of these scraper bars, and in some cases the action bf foreign matter, which has passed through the rolls, the edges of the teeth become worn or broken, which necessitates immediate repairs in order that the rolls may be continued in service. The average type of milling machine is not large enough, nor suitable for quick repair work of this kind, especially in view of the accuracy required. It is essential that the teeth of a scraper bar be uniform in shape, uniform in pitch, and in alignment along the entire length of the bar. In order to obtain this uniformity, considerable care is necessary in setting up the narrow bar before milling the teeth, and when once set up, it is desirable that all the teeth be cut or re-formed without disturbing the bar. Such an operation requires a machine adapted to support and carry a bar for such an operation. The ordinary type of milling machine does not have these features, and the repair departments of sugar plantations are not generally equipped with a special milling machine of suitable size or type for such an operation. There is, how- Serial No. 30,516.

ever, usually either a planer or shaper in the machine equipment of a sugar plantation.

The principal object of this invention is to provide an attachment which may be readily applied to the cross rail or a stationary side head or part of either a planer or a shaper, whereby either will be adapted to perform the operation of milling a scraper bar in an eflic ient manner.

A further purpose is to provide a compact, effective machine for cutting scraper teeth and the like.

Another object of the invention is to provide an attachment for the purpose abovementioned, which will be a complete milling unit in itself.

Still another object of the invention is to provide such a unitary device wherein the necessary or desirable cutter speeds, such as the rotary cutting speed and the transverse feeding speed may be obtained.

A further object is to provide an attachment having power means for driving the milling cutter, means for feeding the cutter manually or by power transversely across the work to be milled, and attaching means for the device'whereby the same may be readily applied to a machine of the character above described.

To these and other ends, the inventioncon" sists of the novel features and combination of parts to be hereinafter described and claimed.

In the accompanying drawings:

Fig. 1 is a side view of an attachment, embodying the features of my invention, shown operably connected to the principal parts of one type of planer;

Fig. 2 is a plan top view of the attachment shown in Fig. 1;

Fig. 3 is a front view of the attachment shown in Fig. 1, and a partial view of the movable work carriage of the planer also shown in Fig. 1;

Fig. 4c is a top plan view of the supporting bracket of the attachment.

Fig. 5 is a section on line 55 of Fig. 2;

Fig. 6 is a section of the lower part of the attachment on line 66 of Fig. 2;

Fig. 7 is a side view of the attachment and the manner of attaching the same to another type of planer;

Fig. 8 is an enlaregd side view of the connecting means between the attachment and the cross rail of the type of planer shown in Fig. 7

Fig. 9 is a broken section generally on lines 99 of Fig. 7; and

Fig. 10 is a top view of the parts shown in Fig. 8.

The planing machine generally found in repair shops is composed of three principal parts which are known as the head, the cutter support, and the work carriage. Of these, the work carriage is reciprocable relatively to the other two. One type of such a machine is generally illustrated in Fig. 1, and has a side head designated by the numeral 10, and a work carriage which is reciprocable relatively to the head is designated by the numeral 11. In a shaper, similar parts and movements thereof are found, with the exception that while in a planer the work carriage is reciprocable, in a shaper, the cutter carriage is generally the reciprocating part. When the attachment of this invention is applied to a planer of the type shown in Fig. 1, the cutting carriage thereof is removed and she usual power feed for the work carriage is disconnected, and when applied to a shaper, the power drive for the cutter carriage is disconnected as well. In the drawings as above noted, Fig. 1 shows only a partial view of a planer from which the cutter carriage has been removed, leaving the side head 10 and the reciprocable work carriage 11 in operative position. It is apparent from the above that the work carriages of either a shaper or planer will, because of the changes noted, he reciprocable by the usual hand feed mechanism only. Such a movement is usually obtained'by means of a screw threaded rod 12. Suitable work clamping means 13 is provided upon the work carriage by which the scraper bar or the like 14, is secured to the same.

The attachment illustrated in the drawings, and which embodies the features of this invention, comprises-a bracket 15 which is provided with a suitable support engaging base portion 16'. This base portion is shown bolted to the side head10 by the headed screws 17. These screws may thread directly into the head. but if, as is generally the case in planers, the side head is provided with T slots, a T headed bolt may be used, thus allowing vertical adjustment for the attachment. The bracket 15 is also provided with an outwardly extending platform portion 18, the side edges of which are formed into dove-tail'tongues 19 and 20. A feed screw nut 23 is secured in the proper position upon the portion 18 by suitable means, shown in the drawings to comprise an integral lug 21 and screws 22. The tongues 19 and 20 extend beyond the portion 18 at either side thereof, whereby an opening 24 is formed therebetween to provide a clearance space for other parts of the attachment.

A frame member 25 is illustrated as being slidably mounted upon the bracket 15 and engages the tongues 19 and 20 by means of dove-tail groove" and 27, respectively, a tight tit being assured by the use of an adj ustable strip 28. An electric motor and a gear support casing 31 are mounted upon a platform portion 29 of the frame The gear support casing 31 encloses and supports a worm 32, which is in mesh with a worm wheel 33, also secured within the casing. The worm 32 is mounted upon and keyed to a shaft 3'7, which provided with a pulley 36 at the outside of the casing 31. The pulley 36 is operatively connected to a pulley 3 1 of the motor P10 by a silent chain bell 55. The worm wheel 33 is mounted upon and keyed to a shaft 38 which extends at rightangles to the shaft 37. At one end of the shaft 38 there is mounted and keyed to same, a bevel gear 39 which meshes with mother bevel gear 10, mounted upon and keyed to a shaft 11. The shaft d1 extends through and is supported by a bearing 42, provided in an arm 4:51 which extends upwardly from the platform portion 29, and has a pulley l i loosely mounted adjacent its outer end. The pulley 41 iis provided with a hub portion having clutch teeth. 45 cut therein, which are adapted to mesh with similar teeth i6 provided in a slidablc sleeve 47, sup ported by and keyed to the outer end of the shaft 41. By sliding the sleeve 47, the clutch teeth {l-ii and 2-" are engaged or disengaged to connect or disconnectthe loose pulley 4 1 to or from the shaft all, as desired.

A spur gear member l8 of a series of change gears, comprising additional gca ll), and 51, is mounted upon and keyed to the outer end of the shaft 38. The gears 19 and 50 are supported in mesh and intermediate the gears 48 and 51, upon hearing studs 52 and respectively, which Iii-e secured to another upwardly extending portion 5 1 of the frame 25. The gear 51 is mounted. upon and keyed to a shaft 55, which is supported by a pair of bearing arms 56 and 5?, depending 1 spec-- tively from the frame 25 and straddling the outwardly extending portion 18 of the bracket 15. All of the gears 18, 19, 50 and 51 are removable from their respective supports so that various combinations are obtainable by the use of other similar gears in order to vary the speed relation between the shafts and and by the set of change gears the shaft 55 is rotated in an opposite direction from shaft 38. 2

Intermediate the arms 56 and 57, the shaft 55 is provided with a key portion 58 upon which a milling cutter 59 is mounted By the use of a nut 60, engagin threads (51 npoii the shaft, and spacing collars or collar 72. provision is made for properly locai" .1 the milling cutter on the sha Means also provided whereby the shaft may readily be removed from the hearings in the arms 56 ill and 57, and said means may comprise split bushings 62 and bearing caps 63, as shown.

The pulley 44 is in this instance adapted to operate a silent chain belt: 64, which is in engagement with a pulley 65 mounted upon and keyed to a feed screw 66. The feed screw 66 is supported by and has a bearing in a portion 67, depending slightly below the frame 25. Suitable thrust collars 68 are provided upon the feed screw to obviate lost motion at this point. The feed screw 66 is in alignment with and suitably threaded as at 69 to engage the threads within the feed screw nut 23 mounted upon the su] )1')ori'iing bracket 18. A hand wheel 70 is mounted upon and keyed to the other end of the feed screw so that the same may be rotated as desired to move the frame 25 in either direction relatively to the bracket 18.

The operation of the attachment when used in connection with a planer of the type shown in Fig. 1 and as above described, is as follows: A scraper bar or roll knife 14 is securely clamped upon the work carriage 11 of the planer, and by means of the feed screw 12 is moved with the work carriage into proper position for the cutting teeth of the milling cutter to operate upon the edge thereof, in order to reshape, sharpen or recut the teeth 73 therein. The motor 30 is then started and power is provided to rotate the milling cutter 59 through the belt 35, pulley 36, worm 32, worm wheel 33, shaft 38, change gears 48, 49, 50 and 51 and the shaft 55. The cutter 59 is then caused to feed across the bar by power which is provided through the shaft 41, clutch teeth 45 and 46, pulley 44, belt 64, and pulley 65, to the feed screw 66, which by rotating in the feed screw nut slides the frame 25, with all of the parts mounted there on, along the tongues 19 and 20 of the bracket 15. lVhen one series of cuts has been taken, the milling cutter is backed away after first releasing the clutch teeth 45 and 46 from engagement, by rotating the feed screw 66 manually by means of the hand wheel 70 in the opposite direction. The work carriage of the planer or shaper is then fed along the required distance to present an uncut portion of the bar 14 and the operation above de scribed is repeated.

In the arrangement illustrated. by Figs. 7 to 10, inclusive, the attachment is shown applied to a planer of the type wherein a vertically adjustable cross rail 75 is provided for the transversely movable tool support 76. The cross rail 7 5 is slidably mounted upon a pair of vertical frame members 77 lo-ated one upon each side of the work carriage 78, which is reciprocable therebetween, verti 'al adjustment being obtained for the cross rail by means of threaded rods 79.

The tool support 76 is slidably mounted upon the cross rail by suitable means, such as the cooperating guide tongues 80, the movement thereof being controlled by the threaded rod 81 which suitable engages the tool support at the rear thereof. One part of the tool support, in this instance comprising the plate shaped member 82, is generally provided with a vertical guide portion having tongues 83 thereon. A subbase 84 is preferably provided for use with such a type of planer. The subbase 84 is provided with slideways 85 suitably arranged to slidably engage upon the tongues 83 of the member 82. Vertical adjustment of the subbase 84 upon the member 82 is obtained by rotating the threaded rod 86, which is engaged within a threaded hole in the member 82 and rotatably secured to the subbase 84 within a hearing in the lug 87 by means of thrust collars 88 and 89, respectively, a handle (not shown) of any well known type being used to rotate the rod 86 by engagement with the flat sides 90 thereof.

The bracket 15 of the attachment above described is mounted upon the subbase 84 by means of screws 91, whereby vertical adjustment of the subbase 84 by the threaded rod 86 will be transmitted to the attachment. Any and all transverse movement of the tool support 76 because of the above structure will also be transmitted to the attachment as well as any and all vertical movement of the cross rail 75.

In some instances it is advisable or desirable to provide a support for the outwardly extending ends 19 and 20 of the attachment above described, in order to more rigidly support the same. The adjustable support 100 shown in Fig. 7 for this purpose. This support comprises a standard 101 having bolts 102 and 103 threaded into each end respectively, each bolt being provided with a lock nut 104. The head 105 of the upper belt 102 is allowed to seat in the depression or seat 106 in the outwardly extending portions 19 and 20 of the bracket 15. A support 100 provided for each of the outwardly projecting portions 19 and 20 so as to equaliae and properly supportboth extensions. l he supports are extensible, as is obvious, by inea us of the bolts 102 and 103.

The operation of the attachment when used wth the type of planer illustrated in Figs. 7 to 10, inclusive, is similar to that above described, but the transverse movement of the tool support 76 obtained by rotation of the threaded rod 81 is used to move the at tachment along the work, which in this instance is mounted upon the work carriage 78 transversely thereof, the amount required when anew sctof teeth are to be operated upon by the cutter. The vertical adjusting rods 79 are used to locate the cross rail and the members mounted thereon substantially in operative position, and the adusting rod 86 ill) lit)

operating upon the subbase 84 allows the more accurate vertical adjustment of the attachmentfor the proper depth of cut.

\Vhile I have illustrated and described a preferred embodiment of my invention, it will be understood that the same is not limited thereto in all of its details, but is capable of many modifications and variations which will lie within the spirited the invention and the scope of the appended claims.

Although I have described my invention as an attachment for planers and shapers, particularly adapted to the purpose of resharpenin sugar mill scraper bars, I desire to have it understood that the invention is not limited in all its aspects to an attachment for planet's or shapers or to a machine for cutting or sharpening scraper bar teeth.

lVhat-I claim is:

1. A machine for milling teeth on a scraper bar or the like comprising a frame, a work table on said frame, a bracket mounted on said frame having ways extending in parallel relationship to the surface of said table, a member slidably mounted on said ways, a cutter arbor mounted in said member, said outter arbor having its axis parallel to the sur face of said table, power means mounted on said member for rotating said arbor, and means interposed between said bracket and member for moving said member along said ways, said last named means being driven by said power means.

2. A machine for milling teeth on a scraper bar or the like comprising a frame, a work table on said frame, a b acket mounted on said frame, said bracket being movable in a direction towards and away from said work table and having ways extending in a direction parallel to the upper surface of the table, a member slidably mounted on said ways, a cutter arbor mounted in said member and having its axis parallel to the upper surface of said table, power means mounted on said member for rotating said arbor, and means interposed between said bracket andmember for feeding said member along said bracket, said last named means being driven by said power means.

3. A machine for milling teeth on a scraper bar or the like comprising a frame, a work table on said frame, a bracket mounted on said frame and provided with ways extendin in a direction parallel to the upper surface of said table, a member slidably mounted on said ways, said member being provided with downwardly extending arms straddling said bracket, a cutter arbor mounted in said arms and having its axis parallel to the surface of said table, power means mounted on said member for rotating said arbor, and means interposed between said bracket and member for feeding said member along the ways, said last named means being driven by said power means.

4. A machine for milling teeth on a scraper bar or the like comprising a frame, a work table on said frame, a bracket mounted on said frame and extending in a direction parallel to the surface of said table, ways on said bracket, said ways being parallel to the surface of said table, a member slidably mounted on said ways, said member being provided with downwardly extending arms straddling said bracket, a cutter arbor mounted in said arms and having its axis parallel to the surface of said table, power means mounted on said member for rotating said arbor, change gears mounted on the frame member audconneeting said power means and arbor, and means interposed between said bracket and member for feeding said member along the ways, said last named means being driven by said power means.

5. A machine for milling teeth on a scraper bar or the like comprising a frame, a work table on said frame, a bracket mounted on said frame and extending in a direction parallel to the surface of said table, ways on said bracket, said ways extending parallel to the surface of said table, a member slidably mounted on said ways, said member being provided with downwardly extending arms straddling said bracket, a cutter arbor mounted in said arms and having its axis parallel to the surface of said table, power means mounted on said member for rotating said arbor, change gears mounted on said member and connecting said power means and arbor, and a rotary shaft mounted in said slidable member, said shaft being provided with threads engaging complemental threads in said bracket, said rotary shaft being driven by said power means.

6. A machine for milling teeth on a scraper bar or the like comprising a frame, a work table on said frame, a bracket mounted on said frame and extending, in a direction parallel to the surface of said table, ways on said bracket, said ways extending parallel to the surface of said table, a member slidably mounted on said ways, said member be-.

ing provided with downwardly extending arms straddling said bracket, a cutter arbor mounted in said arms and having its axis parallel to the surface of said table, power means mounted on said member for rotating said arbor, change gears mounted on said member and connecting said power means and arbor, a rotary shaft mounted in said slid-able member, said shaft being provided with threads engaging cemplemental threads in said bracket, said rotary shaft being driven by said power means, means for rotating sai d shaft by hand, and means for disconnecting said shaft from said power means when said shaft is rotated by hand.

In witnesse whereof, I have hereunto set my hand this th day of May, 1925.

FREDERICK SCHERR, JR. 

